[gcc r12-9026] libiberty: Fix C89-isms in configure tests

[Florian Weimer]

https://gcc.gnu.org/g:63f3eae53683e857818c4bd3d1de719e1310e22a

commit r12-9026-g63f3eae53683e857818c4bd3d1de719e1310e22a
Author: Florian Weimer <fweimer@redhat.com>
Date:   Tue Oct 18 16:58:48 2022 +0200

    libiberty: Fix C89-isms in configure tests
    
    libiberty/
    
            * acinclude.m4 (ac_cv_func_strncmp_works): Add missing
            int return type and parameter list to the definition of main.
            Include <stdlib.h> and <string.h> for prototypes.
            (ac_cv_c_stack_direction): Add missing
            int return type and parameter list to the definitions of
            main, find_stack_direction.  Include <stdlib.h> for exit
            prototype.
            * configure: Regenerate.
    
    (cherry picked from commit 885b6660c17fb91980b5682514ef54668e544b02)

Diff:
---
 libiberty/acinclude.m4 | 14 +++++++++++---
 libiberty/configure    | 14 +++++++++++---
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/libiberty/acinclude.m4 b/libiberty/acinclude.m4
index 6bd127e9826..6bb690597bf 100644
--- a/libiberty/acinclude.m4
+++ b/libiberty/acinclude.m4
@@ -24,6 +24,8 @@ AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works,
 [AC_TRY_RUN([
 /* Test by Jim Wilson and Kaveh Ghazi.
    Check whether strncmp reads past the end of its string parameters. */
+#include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
 
 #ifdef HAVE_FCNTL_H
@@ -51,7 +53,8 @@ AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works,
 
 #define MAP_LEN 0x10000
 
-main ()
+int
+main (void)
 {
 #if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
   char *p;
@@ -157,7 +160,10 @@ if test $ac_cv_os_cray = yes; then
 fi
 
 AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
-[AC_TRY_RUN([find_stack_direction ()
+[AC_TRY_RUN([#include <stdlib.h>
+
+int
+find_stack_direction (void)
 {
   static char *addr = 0;
   auto char dummy;
@@ -169,7 +175,9 @@ AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
   else
     return (&dummy > addr) ? 1 : -1;
 }
-main ()
+
+int
+main (void)
 {
   exit (find_stack_direction() < 0);
 }],
diff --git a/libiberty/configure b/libiberty/configure
index 0a797255c70..ca83f89da6d 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -6780,7 +6780,10 @@ else
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-find_stack_direction ()
+#include <stdlib.h>
+
+int
+find_stack_direction (void)
 {
   static char *addr = 0;
   auto char dummy;
@@ -6792,7 +6795,9 @@ find_stack_direction ()
   else
     return (&dummy > addr) ? 1 : -1;
 }
-main ()
+
+int
+main (void)
 {
   exit (find_stack_direction() < 0);
 }
@@ -7617,6 +7622,8 @@ else
 
 /* Test by Jim Wilson and Kaveh Ghazi.
    Check whether strncmp reads past the end of its string parameters. */
+#include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
 
 #ifdef HAVE_FCNTL_H
@@ -7644,7 +7651,8 @@ else
 
 #define MAP_LEN 0x10000
 
-main ()
+int
+main (void)
 {
 #if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
   char *p;